
/*
 * machinarium.
 *
 * cooperative multitasking engine.
 */

#include <string.h>

#include <machinarium/machinarium.h>
#include <machinarium/coroutine.h>
#include <machinarium/call.h>
#include <machinarium/memory.h>

void mm_coroutine_init(mm_coroutine_t *coroutine)
{
	memset(coroutine, 0, sizeof(mm_coroutine_t));
	coroutine->id = UINT64_MAX;
	coroutine->state = MM_CNEW;
	coroutine->errno_ = 0;
	coroutine->call_ptr = NULL;
	memset(coroutine->name, 0, MM_COROUTINE_MAX_NAME_LEN + 1);
	mm_list_init(&coroutine->joiners);
	mm_list_init(&coroutine->link);
	mm_list_init(&coroutine->link_join);
}

mm_coroutine_t *mm_coroutine_allocate(int stack_size, int stack_size_guard)
{
	mm_coroutine_t *coroutine;
	coroutine = mm_malloc(sizeof(mm_coroutine_t));
	if (coroutine == NULL) {
		return NULL;
	}
	mm_coroutine_init(coroutine);
	int rc;
	rc = mm_contextstack_create(&coroutine->stack, stack_size,
				    stack_size_guard);
	if (rc == -1) {
		mm_free(coroutine);
		return NULL;
	}
	return coroutine;
}

void mm_coroutine_free(mm_coroutine_t *coroutine)
{
	mm_contextstack_free(&coroutine->stack);
	mm_free(coroutine);
}

void mm_coroutine_cancel(mm_coroutine_t *coroutine)
{
	if (coroutine->cancel) {
		return;
	}
	coroutine->cancel++;
	if (coroutine->call_ptr) {
		mm_call_cancel(coroutine->call_ptr, coroutine);
	}
}

void mm_coroutine_set_name(mm_coroutine_t *coro, const char *name)
{
	if (name == NULL) {
		memset(coro->name, 0, MM_COROUTINE_MAX_NAME_LEN + 1);
		return;
	}

	stpncpy(coro->name, name, MM_COROUTINE_MAX_NAME_LEN);
	coro->name[MM_COROUTINE_MAX_NAME_LEN] = 0;
}

const char *mm_coroutine_get_name(mm_coroutine_t *coro)
{
	return coro->name;
}
